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Old 12th February 2014, 18:27   #2  |  Link
nevcairiel
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Join Date: Mar 2010
Location: Hamburg/Germany
Posts: 10,342
TS files can contain (useless) filler data to achieve a certain fixed bitrate. MKVToolNix removes this filler data, which is why the resulting MKV files are a few percent smaller.
Additionally, TS has a bigger overhead than MKV, so its expected for files to be smaller - how much I cannot say for sure.
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